1 //===-- ObjectFileELF.cpp ------------------------------------- -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "ObjectFileELF.h" 11 12 #include <cassert> 13 #include <algorithm> 14 15 #include "lldb/Core/ArchSpec.h" 16 #include "lldb/Core/DataBuffer.h" 17 #include "lldb/Core/Error.h" 18 #include "lldb/Core/FileSpecList.h" 19 #include "lldb/Core/Module.h" 20 #include "lldb/Core/PluginManager.h" 21 #include "lldb/Core/Section.h" 22 #include "lldb/Core/Stream.h" 23 #include "lldb/Symbol/SymbolContext.h" 24 #include "lldb/Host/Host.h" 25 26 #include "llvm/ADT/PointerUnion.h" 27 28 #define CASE_AND_STREAM(s, def, width) \ 29 case def: s->Printf("%-*s", width, #def); break; 30 31 using namespace lldb; 32 using namespace lldb_private; 33 using namespace elf; 34 using namespace llvm::ELF; 35 36 namespace { 37 //===----------------------------------------------------------------------===// 38 /// @class ELFRelocation 39 /// @brief Generic wrapper for ELFRel and ELFRela. 40 /// 41 /// This helper class allows us to parse both ELFRel and ELFRela relocation 42 /// entries in a generic manner. 43 class ELFRelocation 44 { 45 public: 46 47 /// Constructs an ELFRelocation entry with a personality as given by @p 48 /// type. 49 /// 50 /// @param type Either DT_REL or DT_RELA. Any other value is invalid. 51 ELFRelocation(unsigned type); 52 53 ~ELFRelocation(); 54 55 bool 56 Parse(const lldb_private::DataExtractor &data, uint32_t *offset); 57 58 static unsigned 59 RelocType32(const ELFRelocation &rel); 60 61 static unsigned 62 RelocType64(const ELFRelocation &rel); 63 64 static unsigned 65 RelocSymbol32(const ELFRelocation &rel); 66 67 static unsigned 68 RelocSymbol64(const ELFRelocation &rel); 69 70 private: 71 typedef llvm::PointerUnion<ELFRel*, ELFRela*> RelocUnion; 72 73 RelocUnion reloc; 74 }; 75 76 ELFRelocation::ELFRelocation(unsigned type) 77 { 78 if (type == DT_REL) 79 reloc = new ELFRel(); 80 else if (type == DT_RELA) 81 reloc = new ELFRela(); 82 else { 83 assert(false && "unexpected relocation type"); 84 reloc = static_cast<ELFRel*>(NULL); 85 } 86 } 87 88 ELFRelocation::~ELFRelocation() 89 { 90 if (reloc.is<ELFRel*>()) 91 delete reloc.get<ELFRel*>(); 92 else 93 delete reloc.get<ELFRela*>(); 94 } 95 96 bool 97 ELFRelocation::Parse(const lldb_private::DataExtractor &data, uint32_t *offset) 98 { 99 if (reloc.is<ELFRel*>()) 100 return reloc.get<ELFRel*>()->Parse(data, offset); 101 else 102 return reloc.get<ELFRela*>()->Parse(data, offset); 103 } 104 105 unsigned 106 ELFRelocation::RelocType32(const ELFRelocation &rel) 107 { 108 if (rel.reloc.is<ELFRel*>()) 109 return ELFRel::RelocType32(*rel.reloc.get<ELFRel*>()); 110 else 111 return ELFRela::RelocType32(*rel.reloc.get<ELFRela*>()); 112 } 113 114 unsigned 115 ELFRelocation::RelocType64(const ELFRelocation &rel) 116 { 117 if (rel.reloc.is<ELFRel*>()) 118 return ELFRel::RelocType64(*rel.reloc.get<ELFRel*>()); 119 else 120 return ELFRela::RelocType64(*rel.reloc.get<ELFRela*>()); 121 } 122 123 unsigned 124 ELFRelocation::RelocSymbol32(const ELFRelocation &rel) 125 { 126 if (rel.reloc.is<ELFRel*>()) 127 return ELFRel::RelocSymbol32(*rel.reloc.get<ELFRel*>()); 128 else 129 return ELFRela::RelocSymbol32(*rel.reloc.get<ELFRela*>()); 130 } 131 132 unsigned 133 ELFRelocation::RelocSymbol64(const ELFRelocation &rel) 134 { 135 if (rel.reloc.is<ELFRel*>()) 136 return ELFRel::RelocSymbol64(*rel.reloc.get<ELFRel*>()); 137 else 138 return ELFRela::RelocSymbol64(*rel.reloc.get<ELFRela*>()); 139 } 140 141 } // end anonymous namespace 142 143 //------------------------------------------------------------------ 144 // Static methods. 145 //------------------------------------------------------------------ 146 void 147 ObjectFileELF::Initialize() 148 { 149 PluginManager::RegisterPlugin(GetPluginNameStatic(), 150 GetPluginDescriptionStatic(), 151 CreateInstance, 152 CreateMemoryInstance); 153 } 154 155 void 156 ObjectFileELF::Terminate() 157 { 158 PluginManager::UnregisterPlugin(CreateInstance); 159 } 160 161 const char * 162 ObjectFileELF::GetPluginNameStatic() 163 { 164 return "object-file.elf"; 165 } 166 167 const char * 168 ObjectFileELF::GetPluginDescriptionStatic() 169 { 170 return "ELF object file reader."; 171 } 172 173 ObjectFile * 174 ObjectFileELF::CreateInstance (const lldb::ModuleSP &module_sp, 175 DataBufferSP &data_sp, 176 const FileSpec *file, 177 addr_t offset, 178 addr_t length) 179 { 180 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT + offset)) 181 { 182 const uint8_t *magic = data_sp->GetBytes() + offset; 183 if (ELFHeader::MagicBytesMatch(magic)) 184 { 185 unsigned address_size = ELFHeader::AddressSizeInBytes(magic); 186 if (address_size == 4 || address_size == 8) 187 { 188 std::auto_ptr<ObjectFileELF> objfile_ap(new ObjectFileELF(module_sp, data_sp, file, offset, length)); 189 ArchSpec spec; 190 if (objfile_ap->GetArchitecture(spec) && 191 objfile_ap->SetModulesArchitecture(spec)) 192 return objfile_ap.release(); 193 } 194 } 195 } 196 return NULL; 197 } 198 199 200 ObjectFile* 201 ObjectFileELF::CreateMemoryInstance (const lldb::ModuleSP &module_sp, 202 DataBufferSP& data_sp, 203 const lldb::ProcessSP &process_sp, 204 lldb::addr_t header_addr) 205 { 206 return NULL; 207 } 208 209 210 //------------------------------------------------------------------ 211 // PluginInterface protocol 212 //------------------------------------------------------------------ 213 const char * 214 ObjectFileELF::GetPluginName() 215 { 216 return "ObjectFileELF"; 217 } 218 219 const char * 220 ObjectFileELF::GetShortPluginName() 221 { 222 return GetPluginNameStatic(); 223 } 224 225 uint32_t 226 ObjectFileELF::GetPluginVersion() 227 { 228 return m_plugin_version; 229 } 230 //------------------------------------------------------------------ 231 // ObjectFile protocol 232 //------------------------------------------------------------------ 233 234 ObjectFileELF::ObjectFileELF (const lldb::ModuleSP &module_sp, 235 DataBufferSP& dataSP, 236 const FileSpec* file, 237 addr_t offset, 238 addr_t length) : 239 ObjectFile(module_sp, file, offset, length, dataSP), 240 m_header(), 241 m_program_headers(), 242 m_section_headers(), 243 m_sections_ap(), 244 m_symtab_ap(), 245 m_filespec_ap(), 246 m_shstr_data() 247 { 248 if (file) 249 m_file = *file; 250 ::memset(&m_header, 0, sizeof(m_header)); 251 } 252 253 ObjectFileELF::~ObjectFileELF() 254 { 255 } 256 257 bool 258 ObjectFileELF::IsExecutable() const 259 { 260 return m_header.e_entry != 0; 261 } 262 263 ByteOrder 264 ObjectFileELF::GetByteOrder() const 265 { 266 if (m_header.e_ident[EI_DATA] == ELFDATA2MSB) 267 return eByteOrderBig; 268 if (m_header.e_ident[EI_DATA] == ELFDATA2LSB) 269 return eByteOrderLittle; 270 return eByteOrderInvalid; 271 } 272 273 size_t 274 ObjectFileELF::GetAddressByteSize() const 275 { 276 return m_data.GetAddressByteSize(); 277 } 278 279 unsigned 280 ObjectFileELF::SectionIndex(const SectionHeaderCollIter &I) 281 { 282 return std::distance(m_section_headers.begin(), I) + 1; 283 } 284 285 unsigned 286 ObjectFileELF::SectionIndex(const SectionHeaderCollConstIter &I) const 287 { 288 return std::distance(m_section_headers.begin(), I) + 1; 289 } 290 291 bool 292 ObjectFileELF::ParseHeader() 293 { 294 uint32_t offset = GetOffset(); 295 return m_header.Parse(m_data, &offset); 296 } 297 298 bool 299 ObjectFileELF::GetUUID(lldb_private::UUID* uuid) 300 { 301 // FIXME: Return MD5 sum here. See comment in ObjectFile.h. 302 return false; 303 } 304 305 uint32_t 306 ObjectFileELF::GetDependentModules(FileSpecList &files) 307 { 308 size_t num_modules = ParseDependentModules(); 309 uint32_t num_specs = 0; 310 311 for (unsigned i = 0; i < num_modules; ++i) 312 { 313 if (files.AppendIfUnique(m_filespec_ap->GetFileSpecAtIndex(i))) 314 num_specs++; 315 } 316 317 return num_specs; 318 } 319 320 user_id_t 321 ObjectFileELF::GetSectionIndexByType(unsigned type) 322 { 323 if (!ParseSectionHeaders()) 324 return 0; 325 326 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 327 sh_pos != m_section_headers.end(); ++sh_pos) 328 { 329 if (sh_pos->sh_type == type) 330 return SectionIndex(sh_pos); 331 } 332 333 return 0; 334 } 335 336 Address 337 ObjectFileELF::GetImageInfoAddress() 338 { 339 if (!ParseDynamicSymbols()) 340 return Address(); 341 342 SectionList *section_list = GetSectionList(); 343 if (!section_list) 344 return Address(); 345 346 user_id_t dynsym_id = GetSectionIndexByType(SHT_DYNAMIC); 347 if (!dynsym_id) 348 return Address(); 349 350 const ELFSectionHeader *dynsym_hdr = GetSectionHeaderByIndex(dynsym_id); 351 if (!dynsym_hdr) 352 return Address(); 353 354 SectionSP dynsym_section_sp (section_list->FindSectionByID(dynsym_id)); 355 if (dynsym_section_sp) 356 { 357 for (size_t i = 0; i < m_dynamic_symbols.size(); ++i) 358 { 359 ELFDynamic &symbol = m_dynamic_symbols[i]; 360 361 if (symbol.d_tag == DT_DEBUG) 362 { 363 // Compute the offset as the number of previous entries plus the 364 // size of d_tag. 365 addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize(); 366 return Address(dynsym_section_sp, offset); 367 } 368 } 369 } 370 371 return Address(); 372 } 373 374 lldb_private::Address 375 ObjectFileELF::GetEntryPointAddress () 376 { 377 SectionList *sections; 378 addr_t offset; 379 380 if (m_entry_point_address.IsValid()) 381 return m_entry_point_address; 382 383 if (!ParseHeader() || !IsExecutable()) 384 return m_entry_point_address; 385 386 sections = GetSectionList(); 387 offset = m_header.e_entry; 388 389 if (!sections) 390 { 391 m_entry_point_address.SetOffset(offset); 392 return m_entry_point_address; 393 } 394 395 m_entry_point_address.ResolveAddressUsingFileSections(offset, sections); 396 397 return m_entry_point_address; 398 } 399 400 //---------------------------------------------------------------------- 401 // ParseDependentModules 402 //---------------------------------------------------------------------- 403 size_t 404 ObjectFileELF::ParseDependentModules() 405 { 406 if (m_filespec_ap.get()) 407 return m_filespec_ap->GetSize(); 408 409 m_filespec_ap.reset(new FileSpecList()); 410 411 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 412 return 0; 413 414 // Locate the dynamic table. 415 user_id_t dynsym_id = 0; 416 user_id_t dynstr_id = 0; 417 for (SectionHeaderCollIter sh_pos = m_section_headers.begin(); 418 sh_pos != m_section_headers.end(); ++sh_pos) 419 { 420 if (sh_pos->sh_type == SHT_DYNAMIC) 421 { 422 dynsym_id = SectionIndex(sh_pos); 423 dynstr_id = sh_pos->sh_link + 1; // Section ID's are 1 based. 424 break; 425 } 426 } 427 428 if (!(dynsym_id && dynstr_id)) 429 return 0; 430 431 SectionList *section_list = GetSectionList(); 432 if (!section_list) 433 return 0; 434 435 // Resolve and load the dynamic table entries and corresponding string 436 // table. 437 Section *dynsym = section_list->FindSectionByID(dynsym_id).get(); 438 Section *dynstr = section_list->FindSectionByID(dynstr_id).get(); 439 if (!(dynsym && dynstr)) 440 return 0; 441 442 DataExtractor dynsym_data; 443 DataExtractor dynstr_data; 444 if (ReadSectionData(dynsym, dynsym_data) && 445 ReadSectionData(dynstr, dynstr_data)) 446 { 447 ELFDynamic symbol; 448 const unsigned section_size = dynsym_data.GetByteSize(); 449 unsigned offset = 0; 450 451 // The only type of entries we are concerned with are tagged DT_NEEDED, 452 // yielding the name of a required library. 453 while (offset < section_size) 454 { 455 if (!symbol.Parse(dynsym_data, &offset)) 456 break; 457 458 if (symbol.d_tag != DT_NEEDED) 459 continue; 460 461 uint32_t str_index = static_cast<uint32_t>(symbol.d_val); 462 const char *lib_name = dynstr_data.PeekCStr(str_index); 463 m_filespec_ap->Append(FileSpec(lib_name, true)); 464 } 465 } 466 467 return m_filespec_ap->GetSize(); 468 } 469 470 //---------------------------------------------------------------------- 471 // ParseProgramHeaders 472 //---------------------------------------------------------------------- 473 size_t 474 ObjectFileELF::ParseProgramHeaders() 475 { 476 // We have already parsed the program headers 477 if (!m_program_headers.empty()) 478 return m_program_headers.size(); 479 480 // If there are no program headers to read we are done. 481 if (m_header.e_phnum == 0) 482 return 0; 483 484 m_program_headers.resize(m_header.e_phnum); 485 if (m_program_headers.size() != m_header.e_phnum) 486 return 0; 487 488 const size_t ph_size = m_header.e_phnum * m_header.e_phentsize; 489 const elf_off ph_offset = m_header.e_phoff; 490 DataExtractor data; 491 if (GetData (ph_offset, ph_size, data) != ph_size) 492 return 0; 493 494 uint32_t idx; 495 uint32_t offset; 496 for (idx = 0, offset = 0; idx < m_header.e_phnum; ++idx) 497 { 498 if (m_program_headers[idx].Parse(data, &offset) == false) 499 break; 500 } 501 502 if (idx < m_program_headers.size()) 503 m_program_headers.resize(idx); 504 505 return m_program_headers.size(); 506 } 507 508 //---------------------------------------------------------------------- 509 // ParseSectionHeaders 510 //---------------------------------------------------------------------- 511 size_t 512 ObjectFileELF::ParseSectionHeaders() 513 { 514 // We have already parsed the section headers 515 if (!m_section_headers.empty()) 516 return m_section_headers.size(); 517 518 // If there are no section headers we are done. 519 if (m_header.e_shnum == 0) 520 return 0; 521 522 m_section_headers.resize(m_header.e_shnum); 523 if (m_section_headers.size() != m_header.e_shnum) 524 return 0; 525 526 const size_t sh_size = m_header.e_shnum * m_header.e_shentsize; 527 const elf_off sh_offset = m_header.e_shoff; 528 DataExtractor data; 529 if (GetData (sh_offset, sh_size, data) != sh_size) 530 return 0; 531 532 uint32_t idx; 533 uint32_t offset; 534 for (idx = 0, offset = 0; idx < m_header.e_shnum; ++idx) 535 { 536 if (m_section_headers[idx].Parse(data, &offset) == false) 537 break; 538 } 539 if (idx < m_section_headers.size()) 540 m_section_headers.resize(idx); 541 542 return m_section_headers.size(); 543 } 544 545 size_t 546 ObjectFileELF::GetSectionHeaderStringTable() 547 { 548 if (m_shstr_data.GetByteSize() == 0) 549 { 550 const unsigned strtab_idx = m_header.e_shstrndx; 551 552 if (strtab_idx && strtab_idx < m_section_headers.size()) 553 { 554 const ELFSectionHeader &sheader = m_section_headers[strtab_idx]; 555 const size_t byte_size = sheader.sh_size; 556 const Elf64_Off offset = sheader.sh_offset; 557 m_shstr_data.SetData (m_data, offset, byte_size); 558 559 if (m_shstr_data.GetByteSize() != byte_size) 560 return 0; 561 } 562 } 563 return m_shstr_data.GetByteSize(); 564 } 565 566 lldb::user_id_t 567 ObjectFileELF::GetSectionIndexByName(const char *name) 568 { 569 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 570 return 0; 571 572 // Search the collection of section headers for one with a matching name. 573 for (SectionHeaderCollIter I = m_section_headers.begin(); 574 I != m_section_headers.end(); ++I) 575 { 576 const char *sectionName = m_shstr_data.PeekCStr(I->sh_name); 577 578 if (!sectionName) 579 return 0; 580 581 if (strcmp(name, sectionName) != 0) 582 continue; 583 584 return SectionIndex(I); 585 } 586 587 return 0; 588 } 589 590 const elf::ELFSectionHeader * 591 ObjectFileELF::GetSectionHeaderByIndex(lldb::user_id_t id) 592 { 593 if (!ParseSectionHeaders() || !id) 594 return NULL; 595 596 if (--id < m_section_headers.size()) 597 return &m_section_headers[id]; 598 599 return NULL; 600 } 601 602 SectionList * 603 ObjectFileELF::GetSectionList() 604 { 605 if (m_sections_ap.get()) 606 return m_sections_ap.get(); 607 608 if (ParseSectionHeaders() && GetSectionHeaderStringTable()) 609 { 610 m_sections_ap.reset(new SectionList()); 611 612 for (SectionHeaderCollIter I = m_section_headers.begin(); 613 I != m_section_headers.end(); ++I) 614 { 615 const ELFSectionHeader &header = *I; 616 617 ConstString name(m_shstr_data.PeekCStr(header.sh_name)); 618 const uint64_t file_size = header.sh_type == SHT_NOBITS ? 0 : header.sh_size; 619 const uint64_t vm_size = header.sh_flags & SHF_ALLOC ? header.sh_size : 0; 620 621 static ConstString g_sect_name_text (".text"); 622 static ConstString g_sect_name_data (".data"); 623 static ConstString g_sect_name_bss (".bss"); 624 static ConstString g_sect_name_dwarf_debug_abbrev (".debug_abbrev"); 625 static ConstString g_sect_name_dwarf_debug_aranges (".debug_aranges"); 626 static ConstString g_sect_name_dwarf_debug_frame (".debug_frame"); 627 static ConstString g_sect_name_dwarf_debug_info (".debug_info"); 628 static ConstString g_sect_name_dwarf_debug_line (".debug_line"); 629 static ConstString g_sect_name_dwarf_debug_loc (".debug_loc"); 630 static ConstString g_sect_name_dwarf_debug_macinfo (".debug_macinfo"); 631 static ConstString g_sect_name_dwarf_debug_pubnames (".debug_pubnames"); 632 static ConstString g_sect_name_dwarf_debug_pubtypes (".debug_pubtypes"); 633 static ConstString g_sect_name_dwarf_debug_ranges (".debug_ranges"); 634 static ConstString g_sect_name_dwarf_debug_str (".debug_str"); 635 static ConstString g_sect_name_eh_frame (".eh_frame"); 636 637 SectionType sect_type = eSectionTypeOther; 638 639 if (name == g_sect_name_text) sect_type = eSectionTypeCode; 640 else if (name == g_sect_name_data) sect_type = eSectionTypeData; 641 else if (name == g_sect_name_bss) sect_type = eSectionTypeZeroFill; 642 else if (name == g_sect_name_dwarf_debug_abbrev) sect_type = eSectionTypeDWARFDebugAbbrev; 643 else if (name == g_sect_name_dwarf_debug_aranges) sect_type = eSectionTypeDWARFDebugAranges; 644 else if (name == g_sect_name_dwarf_debug_frame) sect_type = eSectionTypeDWARFDebugFrame; 645 else if (name == g_sect_name_dwarf_debug_info) sect_type = eSectionTypeDWARFDebugInfo; 646 else if (name == g_sect_name_dwarf_debug_line) sect_type = eSectionTypeDWARFDebugLine; 647 else if (name == g_sect_name_dwarf_debug_loc) sect_type = eSectionTypeDWARFDebugLoc; 648 else if (name == g_sect_name_dwarf_debug_macinfo) sect_type = eSectionTypeDWARFDebugMacInfo; 649 else if (name == g_sect_name_dwarf_debug_pubnames) sect_type = eSectionTypeDWARFDebugPubNames; 650 else if (name == g_sect_name_dwarf_debug_pubtypes) sect_type = eSectionTypeDWARFDebugPubTypes; 651 else if (name == g_sect_name_dwarf_debug_ranges) sect_type = eSectionTypeDWARFDebugRanges; 652 else if (name == g_sect_name_dwarf_debug_str) sect_type = eSectionTypeDWARFDebugStr; 653 else if (name == g_sect_name_eh_frame) sect_type = eSectionTypeEHFrame; 654 655 656 SectionSP section(new Section( 657 GetModule(), // Module to which this section belongs. 658 SectionIndex(I), // Section ID. 659 name, // Section name. 660 sect_type, // Section type. 661 header.sh_addr, // VM address. 662 vm_size, // VM size in bytes of this section. 663 header.sh_offset, // Offset of this section in the file. 664 file_size, // Size of the section as found in the file. 665 header.sh_flags)); // Flags for this section. 666 667 m_sections_ap->AddSection(section); 668 } 669 } 670 671 return m_sections_ap.get(); 672 } 673 674 static unsigned 675 ParseSymbols(Symtab *symtab, 676 user_id_t start_id, 677 SectionList *section_list, 678 const ELFSectionHeader *symtab_shdr, 679 const DataExtractor &symtab_data, 680 const DataExtractor &strtab_data) 681 { 682 ELFSymbol symbol; 683 uint32_t offset = 0; 684 const unsigned num_symbols = 685 symtab_data.GetByteSize() / symtab_shdr->sh_entsize; 686 687 static ConstString text_section_name(".text"); 688 static ConstString init_section_name(".init"); 689 static ConstString fini_section_name(".fini"); 690 static ConstString ctors_section_name(".ctors"); 691 static ConstString dtors_section_name(".dtors"); 692 693 static ConstString data_section_name(".data"); 694 static ConstString rodata_section_name(".rodata"); 695 static ConstString rodata1_section_name(".rodata1"); 696 static ConstString data2_section_name(".data1"); 697 static ConstString bss_section_name(".bss"); 698 699 unsigned i; 700 for (i = 0; i < num_symbols; ++i) 701 { 702 if (symbol.Parse(symtab_data, &offset) == false) 703 break; 704 705 SectionSP symbol_section_sp; 706 SymbolType symbol_type = eSymbolTypeInvalid; 707 Elf64_Half symbol_idx = symbol.st_shndx; 708 709 switch (symbol_idx) 710 { 711 case SHN_ABS: 712 symbol_type = eSymbolTypeAbsolute; 713 break; 714 case SHN_UNDEF: 715 symbol_type = eSymbolTypeUndefined; 716 break; 717 default: 718 symbol_section_sp = section_list->GetSectionAtIndex(symbol_idx); 719 break; 720 } 721 722 switch (symbol.getType()) 723 { 724 default: 725 case STT_NOTYPE: 726 // The symbol's type is not specified. 727 break; 728 729 case STT_OBJECT: 730 // The symbol is associated with a data object, such as a variable, 731 // an array, etc. 732 symbol_type = eSymbolTypeData; 733 break; 734 735 case STT_FUNC: 736 // The symbol is associated with a function or other executable code. 737 symbol_type = eSymbolTypeCode; 738 break; 739 740 case STT_SECTION: 741 // The symbol is associated with a section. Symbol table entries of 742 // this type exist primarily for relocation and normally have 743 // STB_LOCAL binding. 744 break; 745 746 case STT_FILE: 747 // Conventionally, the symbol's name gives the name of the source 748 // file associated with the object file. A file symbol has STB_LOCAL 749 // binding, its section index is SHN_ABS, and it precedes the other 750 // STB_LOCAL symbols for the file, if it is present. 751 symbol_type = eSymbolTypeObjectFile; 752 break; 753 } 754 755 if (symbol_type == eSymbolTypeInvalid) 756 { 757 if (symbol_section_sp) 758 { 759 const ConstString §_name = symbol_section_sp->GetName(); 760 if (sect_name == text_section_name || 761 sect_name == init_section_name || 762 sect_name == fini_section_name || 763 sect_name == ctors_section_name || 764 sect_name == dtors_section_name) 765 { 766 symbol_type = eSymbolTypeCode; 767 } 768 else if (sect_name == data_section_name || 769 sect_name == data2_section_name || 770 sect_name == rodata_section_name || 771 sect_name == rodata1_section_name || 772 sect_name == bss_section_name) 773 { 774 symbol_type = eSymbolTypeData; 775 } 776 } 777 } 778 779 uint64_t symbol_value = symbol.st_value; 780 if (symbol_section_sp) 781 symbol_value -= symbol_section_sp->GetFileAddress(); 782 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 783 bool is_global = symbol.getBinding() == STB_GLOBAL; 784 uint32_t flags = symbol.st_other << 8 | symbol.st_info; 785 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 786 Symbol dc_symbol( 787 i + start_id, // ID is the original symbol table index. 788 symbol_name, // Symbol name. 789 is_mangled, // Is the symbol name mangled? 790 symbol_type, // Type of this symbol 791 is_global, // Is this globally visible? 792 false, // Is this symbol debug info? 793 false, // Is this symbol a trampoline? 794 false, // Is this symbol artificial? 795 symbol_section_sp, // Section in which this symbol is defined or null. 796 symbol_value, // Offset in section or symbol value. 797 symbol.st_size, // Size in bytes of this symbol. 798 flags); // Symbol flags. 799 symtab->AddSymbol(dc_symbol); 800 } 801 802 return i; 803 } 804 805 unsigned 806 ObjectFileELF::ParseSymbolTable(Symtab *symbol_table, user_id_t start_id, 807 const ELFSectionHeader *symtab_hdr, 808 user_id_t symtab_id) 809 { 810 assert(symtab_hdr->sh_type == SHT_SYMTAB || 811 symtab_hdr->sh_type == SHT_DYNSYM); 812 813 // Parse in the section list if needed. 814 SectionList *section_list = GetSectionList(); 815 if (!section_list) 816 return 0; 817 818 // Section ID's are ones based. 819 user_id_t strtab_id = symtab_hdr->sh_link + 1; 820 821 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 822 Section *strtab = section_list->FindSectionByID(strtab_id).get(); 823 unsigned num_symbols = 0; 824 if (symtab && strtab) 825 { 826 DataExtractor symtab_data; 827 DataExtractor strtab_data; 828 if (ReadSectionData(symtab, symtab_data) && 829 ReadSectionData(strtab, strtab_data)) 830 { 831 num_symbols = ParseSymbols(symbol_table, start_id, 832 section_list, symtab_hdr, 833 symtab_data, strtab_data); 834 } 835 } 836 837 return num_symbols; 838 } 839 840 size_t 841 ObjectFileELF::ParseDynamicSymbols() 842 { 843 if (m_dynamic_symbols.size()) 844 return m_dynamic_symbols.size(); 845 846 user_id_t dyn_id = GetSectionIndexByType(SHT_DYNAMIC); 847 if (!dyn_id) 848 return NULL; 849 850 SectionList *section_list = GetSectionList(); 851 if (!section_list) 852 return NULL; 853 854 Section *dynsym = section_list->FindSectionByID(dyn_id).get(); 855 if (!dynsym) 856 return NULL; 857 858 ELFDynamic symbol; 859 DataExtractor dynsym_data; 860 if (ReadSectionData(dynsym, dynsym_data)) 861 { 862 863 const unsigned section_size = dynsym_data.GetByteSize(); 864 unsigned offset = 0; 865 unsigned cursor = 0; 866 867 while (cursor < section_size) 868 { 869 offset = cursor; 870 if (!symbol.Parse(dynsym_data, &cursor)) 871 break; 872 873 m_dynamic_symbols.push_back(symbol); 874 } 875 } 876 877 return m_dynamic_symbols.size(); 878 } 879 880 const ELFDynamic * 881 ObjectFileELF::FindDynamicSymbol(unsigned tag) 882 { 883 if (!ParseDynamicSymbols()) 884 return NULL; 885 886 SectionList *section_list = GetSectionList(); 887 if (!section_list) 888 return 0; 889 890 DynamicSymbolCollIter I = m_dynamic_symbols.begin(); 891 DynamicSymbolCollIter E = m_dynamic_symbols.end(); 892 for ( ; I != E; ++I) 893 { 894 ELFDynamic *symbol = &*I; 895 896 if (symbol->d_tag == tag) 897 return symbol; 898 } 899 900 return NULL; 901 } 902 903 Section * 904 ObjectFileELF::PLTSection() 905 { 906 const ELFDynamic *symbol = FindDynamicSymbol(DT_JMPREL); 907 SectionList *section_list = GetSectionList(); 908 909 if (symbol && section_list) 910 { 911 addr_t addr = symbol->d_ptr; 912 return section_list->FindSectionContainingFileAddress(addr).get(); 913 } 914 915 return NULL; 916 } 917 918 unsigned 919 ObjectFileELF::PLTRelocationType() 920 { 921 const ELFDynamic *symbol = FindDynamicSymbol(DT_PLTREL); 922 923 if (symbol) 924 return symbol->d_val; 925 926 return 0; 927 } 928 929 static unsigned 930 ParsePLTRelocations(Symtab *symbol_table, 931 user_id_t start_id, 932 unsigned rel_type, 933 const ELFHeader *hdr, 934 const ELFSectionHeader *rel_hdr, 935 const ELFSectionHeader *plt_hdr, 936 const ELFSectionHeader *sym_hdr, 937 const lldb::SectionSP &plt_section_sp, 938 DataExtractor &rel_data, 939 DataExtractor &symtab_data, 940 DataExtractor &strtab_data) 941 { 942 ELFRelocation rel(rel_type); 943 ELFSymbol symbol; 944 uint32_t offset = 0; 945 const unsigned plt_entsize = plt_hdr->sh_entsize; 946 const unsigned num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 947 948 typedef unsigned (*reloc_info_fn)(const ELFRelocation &rel); 949 reloc_info_fn reloc_type; 950 reloc_info_fn reloc_symbol; 951 952 if (hdr->Is32Bit() == 4) 953 { 954 reloc_type = ELFRelocation::RelocType32; 955 reloc_symbol = ELFRelocation::RelocSymbol32; 956 } 957 else 958 { 959 reloc_type = ELFRelocation::RelocType64; 960 reloc_symbol = ELFRelocation::RelocSymbol64; 961 } 962 963 unsigned slot_type = hdr->GetRelocationJumpSlotType(); 964 unsigned i; 965 for (i = 0; i < num_relocations; ++i) 966 { 967 if (rel.Parse(rel_data, &offset) == false) 968 break; 969 970 if (reloc_type(rel) != slot_type) 971 continue; 972 973 unsigned symbol_offset = reloc_symbol(rel) * sym_hdr->sh_entsize; 974 uint64_t plt_index = (i + 1) * plt_entsize; 975 976 if (!symbol.Parse(symtab_data, &symbol_offset)) 977 break; 978 979 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 980 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 981 982 Symbol jump_symbol( 983 i + start_id, // Symbol table index 984 symbol_name, // symbol name. 985 is_mangled, // is the symbol name mangled? 986 eSymbolTypeTrampoline, // Type of this symbol 987 false, // Is this globally visible? 988 false, // Is this symbol debug info? 989 true, // Is this symbol a trampoline? 990 true, // Is this symbol artificial? 991 plt_section_sp, // Section in which this symbol is defined or null. 992 plt_index, // Offset in section or symbol value. 993 plt_entsize, // Size in bytes of this symbol. 994 0); // Symbol flags. 995 996 symbol_table->AddSymbol(jump_symbol); 997 } 998 999 return i; 1000 } 1001 1002 unsigned 1003 ObjectFileELF::ParseTrampolineSymbols(Symtab *symbol_table, 1004 user_id_t start_id, 1005 const ELFSectionHeader *rel_hdr, 1006 user_id_t rel_id) 1007 { 1008 assert(rel_hdr->sh_type == SHT_RELA || rel_hdr->sh_type == SHT_REL); 1009 1010 // The link field points to the asscoiated symbol table. The info field 1011 // points to the section holding the plt. 1012 user_id_t symtab_id = rel_hdr->sh_link; 1013 user_id_t plt_id = rel_hdr->sh_info; 1014 1015 if (!symtab_id || !plt_id) 1016 return 0; 1017 1018 // Section ID's are ones based; 1019 symtab_id++; 1020 plt_id++; 1021 1022 const ELFSectionHeader *plt_hdr = GetSectionHeaderByIndex(plt_id); 1023 if (!plt_hdr) 1024 return 0; 1025 1026 const ELFSectionHeader *sym_hdr = GetSectionHeaderByIndex(symtab_id); 1027 if (!sym_hdr) 1028 return 0; 1029 1030 SectionList *section_list = GetSectionList(); 1031 if (!section_list) 1032 return 0; 1033 1034 Section *rel_section = section_list->FindSectionByID(rel_id).get(); 1035 if (!rel_section) 1036 return 0; 1037 1038 SectionSP plt_section_sp (section_list->FindSectionByID(plt_id)); 1039 if (!plt_section_sp) 1040 return 0; 1041 1042 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 1043 if (!symtab) 1044 return 0; 1045 1046 Section *strtab = section_list->FindSectionByID(sym_hdr->sh_link + 1).get(); 1047 if (!strtab) 1048 return 0; 1049 1050 DataExtractor rel_data; 1051 if (!ReadSectionData(rel_section, rel_data)) 1052 return 0; 1053 1054 DataExtractor symtab_data; 1055 if (!ReadSectionData(symtab, symtab_data)) 1056 return 0; 1057 1058 DataExtractor strtab_data; 1059 if (!ReadSectionData(strtab, strtab_data)) 1060 return 0; 1061 1062 unsigned rel_type = PLTRelocationType(); 1063 if (!rel_type) 1064 return 0; 1065 1066 return ParsePLTRelocations (symbol_table, 1067 start_id, 1068 rel_type, 1069 &m_header, 1070 rel_hdr, 1071 plt_hdr, 1072 sym_hdr, 1073 plt_section_sp, 1074 rel_data, 1075 symtab_data, 1076 strtab_data); 1077 } 1078 1079 Symtab * 1080 ObjectFileELF::GetSymtab() 1081 { 1082 if (m_symtab_ap.get()) 1083 return m_symtab_ap.get(); 1084 1085 Symtab *symbol_table = new Symtab(this); 1086 m_symtab_ap.reset(symbol_table); 1087 1088 Mutex::Locker locker(symbol_table->GetMutex()); 1089 1090 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1091 return symbol_table; 1092 1093 // Locate and parse all linker symbol tables. 1094 uint64_t symbol_id = 0; 1095 for (SectionHeaderCollIter I = m_section_headers.begin(); 1096 I != m_section_headers.end(); ++I) 1097 { 1098 if (I->sh_type == SHT_SYMTAB || I->sh_type == SHT_DYNSYM) 1099 { 1100 const ELFSectionHeader &symtab_header = *I; 1101 user_id_t section_id = SectionIndex(I); 1102 symbol_id += ParseSymbolTable(symbol_table, symbol_id, 1103 &symtab_header, section_id); 1104 } 1105 } 1106 1107 // Synthesize trampoline symbols to help navigate the PLT. 1108 Section *reloc_section = PLTSection(); 1109 if (reloc_section) 1110 { 1111 user_id_t reloc_id = reloc_section->GetID(); 1112 const ELFSectionHeader *reloc_header = GetSectionHeaderByIndex(reloc_id); 1113 assert(reloc_header); 1114 1115 ParseTrampolineSymbols(symbol_table, symbol_id, reloc_header, reloc_id); 1116 } 1117 1118 return symbol_table; 1119 } 1120 1121 //===----------------------------------------------------------------------===// 1122 // Dump 1123 // 1124 // Dump the specifics of the runtime file container (such as any headers 1125 // segments, sections, etc). 1126 //---------------------------------------------------------------------- 1127 void 1128 ObjectFileELF::Dump(Stream *s) 1129 { 1130 DumpELFHeader(s, m_header); 1131 s->EOL(); 1132 DumpELFProgramHeaders(s); 1133 s->EOL(); 1134 DumpELFSectionHeaders(s); 1135 s->EOL(); 1136 SectionList *section_list = GetSectionList(); 1137 if (section_list) 1138 section_list->Dump(s, NULL, true, UINT32_MAX); 1139 Symtab *symtab = GetSymtab(); 1140 if (symtab) 1141 symtab->Dump(s, NULL, eSortOrderNone); 1142 s->EOL(); 1143 DumpDependentModules(s); 1144 s->EOL(); 1145 } 1146 1147 //---------------------------------------------------------------------- 1148 // DumpELFHeader 1149 // 1150 // Dump the ELF header to the specified output stream 1151 //---------------------------------------------------------------------- 1152 void 1153 ObjectFileELF::DumpELFHeader(Stream *s, const ELFHeader &header) 1154 { 1155 s->PutCString("ELF Header\n"); 1156 s->Printf("e_ident[EI_MAG0 ] = 0x%2.2x\n", header.e_ident[EI_MAG0]); 1157 s->Printf("e_ident[EI_MAG1 ] = 0x%2.2x '%c'\n", 1158 header.e_ident[EI_MAG1], header.e_ident[EI_MAG1]); 1159 s->Printf("e_ident[EI_MAG2 ] = 0x%2.2x '%c'\n", 1160 header.e_ident[EI_MAG2], header.e_ident[EI_MAG2]); 1161 s->Printf("e_ident[EI_MAG3 ] = 0x%2.2x '%c'\n", 1162 header.e_ident[EI_MAG3], header.e_ident[EI_MAG3]); 1163 1164 s->Printf("e_ident[EI_CLASS ] = 0x%2.2x\n", header.e_ident[EI_CLASS]); 1165 s->Printf("e_ident[EI_DATA ] = 0x%2.2x ", header.e_ident[EI_DATA]); 1166 DumpELFHeader_e_ident_EI_DATA(s, header.e_ident[EI_DATA]); 1167 s->Printf ("\ne_ident[EI_VERSION] = 0x%2.2x\n", header.e_ident[EI_VERSION]); 1168 s->Printf ("e_ident[EI_PAD ] = 0x%2.2x\n", header.e_ident[EI_PAD]); 1169 1170 s->Printf("e_type = 0x%4.4x ", header.e_type); 1171 DumpELFHeader_e_type(s, header.e_type); 1172 s->Printf("\ne_machine = 0x%4.4x\n", header.e_machine); 1173 s->Printf("e_version = 0x%8.8x\n", header.e_version); 1174 s->Printf("e_entry = 0x%8.8llx\n", header.e_entry); 1175 s->Printf("e_phoff = 0x%8.8llx\n", header.e_phoff); 1176 s->Printf("e_shoff = 0x%8.8llx\n", header.e_shoff); 1177 s->Printf("e_flags = 0x%8.8x\n", header.e_flags); 1178 s->Printf("e_ehsize = 0x%4.4x\n", header.e_ehsize); 1179 s->Printf("e_phentsize = 0x%4.4x\n", header.e_phentsize); 1180 s->Printf("e_phnum = 0x%4.4x\n", header.e_phnum); 1181 s->Printf("e_shentsize = 0x%4.4x\n", header.e_shentsize); 1182 s->Printf("e_shnum = 0x%4.4x\n", header.e_shnum); 1183 s->Printf("e_shstrndx = 0x%4.4x\n", header.e_shstrndx); 1184 } 1185 1186 //---------------------------------------------------------------------- 1187 // DumpELFHeader_e_type 1188 // 1189 // Dump an token value for the ELF header member e_type 1190 //---------------------------------------------------------------------- 1191 void 1192 ObjectFileELF::DumpELFHeader_e_type(Stream *s, elf_half e_type) 1193 { 1194 switch (e_type) 1195 { 1196 case ET_NONE: *s << "ET_NONE"; break; 1197 case ET_REL: *s << "ET_REL"; break; 1198 case ET_EXEC: *s << "ET_EXEC"; break; 1199 case ET_DYN: *s << "ET_DYN"; break; 1200 case ET_CORE: *s << "ET_CORE"; break; 1201 default: 1202 break; 1203 } 1204 } 1205 1206 //---------------------------------------------------------------------- 1207 // DumpELFHeader_e_ident_EI_DATA 1208 // 1209 // Dump an token value for the ELF header member e_ident[EI_DATA] 1210 //---------------------------------------------------------------------- 1211 void 1212 ObjectFileELF::DumpELFHeader_e_ident_EI_DATA(Stream *s, unsigned char ei_data) 1213 { 1214 switch (ei_data) 1215 { 1216 case ELFDATANONE: *s << "ELFDATANONE"; break; 1217 case ELFDATA2LSB: *s << "ELFDATA2LSB - Little Endian"; break; 1218 case ELFDATA2MSB: *s << "ELFDATA2MSB - Big Endian"; break; 1219 default: 1220 break; 1221 } 1222 } 1223 1224 1225 //---------------------------------------------------------------------- 1226 // DumpELFProgramHeader 1227 // 1228 // Dump a single ELF program header to the specified output stream 1229 //---------------------------------------------------------------------- 1230 void 1231 ObjectFileELF::DumpELFProgramHeader(Stream *s, const ELFProgramHeader &ph) 1232 { 1233 DumpELFProgramHeader_p_type(s, ph.p_type); 1234 s->Printf(" %8.8llx %8.8llx %8.8llx", ph.p_offset, ph.p_vaddr, ph.p_paddr); 1235 s->Printf(" %8.8llx %8.8llx %8.8x (", ph.p_filesz, ph.p_memsz, ph.p_flags); 1236 1237 DumpELFProgramHeader_p_flags(s, ph.p_flags); 1238 s->Printf(") %8.8llx", ph.p_align); 1239 } 1240 1241 //---------------------------------------------------------------------- 1242 // DumpELFProgramHeader_p_type 1243 // 1244 // Dump an token value for the ELF program header member p_type which 1245 // describes the type of the program header 1246 // ---------------------------------------------------------------------- 1247 void 1248 ObjectFileELF::DumpELFProgramHeader_p_type(Stream *s, elf_word p_type) 1249 { 1250 const int kStrWidth = 10; 1251 switch (p_type) 1252 { 1253 CASE_AND_STREAM(s, PT_NULL , kStrWidth); 1254 CASE_AND_STREAM(s, PT_LOAD , kStrWidth); 1255 CASE_AND_STREAM(s, PT_DYNAMIC , kStrWidth); 1256 CASE_AND_STREAM(s, PT_INTERP , kStrWidth); 1257 CASE_AND_STREAM(s, PT_NOTE , kStrWidth); 1258 CASE_AND_STREAM(s, PT_SHLIB , kStrWidth); 1259 CASE_AND_STREAM(s, PT_PHDR , kStrWidth); 1260 default: 1261 s->Printf("0x%8.8x%*s", p_type, kStrWidth - 10, ""); 1262 break; 1263 } 1264 } 1265 1266 1267 //---------------------------------------------------------------------- 1268 // DumpELFProgramHeader_p_flags 1269 // 1270 // Dump an token value for the ELF program header member p_flags 1271 //---------------------------------------------------------------------- 1272 void 1273 ObjectFileELF::DumpELFProgramHeader_p_flags(Stream *s, elf_word p_flags) 1274 { 1275 *s << ((p_flags & PF_X) ? "PF_X" : " ") 1276 << (((p_flags & PF_X) && (p_flags & PF_W)) ? '+' : ' ') 1277 << ((p_flags & PF_W) ? "PF_W" : " ") 1278 << (((p_flags & PF_W) && (p_flags & PF_R)) ? '+' : ' ') 1279 << ((p_flags & PF_R) ? "PF_R" : " "); 1280 } 1281 1282 //---------------------------------------------------------------------- 1283 // DumpELFProgramHeaders 1284 // 1285 // Dump all of the ELF program header to the specified output stream 1286 //---------------------------------------------------------------------- 1287 void 1288 ObjectFileELF::DumpELFProgramHeaders(Stream *s) 1289 { 1290 if (ParseProgramHeaders()) 1291 { 1292 s->PutCString("Program Headers\n"); 1293 s->PutCString("IDX p_type p_offset p_vaddr p_paddr " 1294 "p_filesz p_memsz p_flags p_align\n"); 1295 s->PutCString("==== ---------- -------- -------- -------- " 1296 "-------- -------- ------------------------- --------\n"); 1297 1298 uint32_t idx = 0; 1299 for (ProgramHeaderCollConstIter I = m_program_headers.begin(); 1300 I != m_program_headers.end(); ++I, ++idx) 1301 { 1302 s->Printf("[%2u] ", idx); 1303 ObjectFileELF::DumpELFProgramHeader(s, *I); 1304 s->EOL(); 1305 } 1306 } 1307 } 1308 1309 //---------------------------------------------------------------------- 1310 // DumpELFSectionHeader 1311 // 1312 // Dump a single ELF section header to the specified output stream 1313 //---------------------------------------------------------------------- 1314 void 1315 ObjectFileELF::DumpELFSectionHeader(Stream *s, const ELFSectionHeader &sh) 1316 { 1317 s->Printf("%8.8x ", sh.sh_name); 1318 DumpELFSectionHeader_sh_type(s, sh.sh_type); 1319 s->Printf(" %8.8llx (", sh.sh_flags); 1320 DumpELFSectionHeader_sh_flags(s, sh.sh_flags); 1321 s->Printf(") %8.8llx %8.8llx %8.8llx", sh.sh_addr, sh.sh_offset, sh.sh_size); 1322 s->Printf(" %8.8x %8.8x", sh.sh_link, sh.sh_info); 1323 s->Printf(" %8.8llx %8.8llx", sh.sh_addralign, sh.sh_entsize); 1324 } 1325 1326 //---------------------------------------------------------------------- 1327 // DumpELFSectionHeader_sh_type 1328 // 1329 // Dump an token value for the ELF section header member sh_type which 1330 // describes the type of the section 1331 //---------------------------------------------------------------------- 1332 void 1333 ObjectFileELF::DumpELFSectionHeader_sh_type(Stream *s, elf_word sh_type) 1334 { 1335 const int kStrWidth = 12; 1336 switch (sh_type) 1337 { 1338 CASE_AND_STREAM(s, SHT_NULL , kStrWidth); 1339 CASE_AND_STREAM(s, SHT_PROGBITS , kStrWidth); 1340 CASE_AND_STREAM(s, SHT_SYMTAB , kStrWidth); 1341 CASE_AND_STREAM(s, SHT_STRTAB , kStrWidth); 1342 CASE_AND_STREAM(s, SHT_RELA , kStrWidth); 1343 CASE_AND_STREAM(s, SHT_HASH , kStrWidth); 1344 CASE_AND_STREAM(s, SHT_DYNAMIC , kStrWidth); 1345 CASE_AND_STREAM(s, SHT_NOTE , kStrWidth); 1346 CASE_AND_STREAM(s, SHT_NOBITS , kStrWidth); 1347 CASE_AND_STREAM(s, SHT_REL , kStrWidth); 1348 CASE_AND_STREAM(s, SHT_SHLIB , kStrWidth); 1349 CASE_AND_STREAM(s, SHT_DYNSYM , kStrWidth); 1350 CASE_AND_STREAM(s, SHT_LOPROC , kStrWidth); 1351 CASE_AND_STREAM(s, SHT_HIPROC , kStrWidth); 1352 CASE_AND_STREAM(s, SHT_LOUSER , kStrWidth); 1353 CASE_AND_STREAM(s, SHT_HIUSER , kStrWidth); 1354 default: 1355 s->Printf("0x%8.8x%*s", sh_type, kStrWidth - 10, ""); 1356 break; 1357 } 1358 } 1359 1360 //---------------------------------------------------------------------- 1361 // DumpELFSectionHeader_sh_flags 1362 // 1363 // Dump an token value for the ELF section header member sh_flags 1364 //---------------------------------------------------------------------- 1365 void 1366 ObjectFileELF::DumpELFSectionHeader_sh_flags(Stream *s, elf_word sh_flags) 1367 { 1368 *s << ((sh_flags & SHF_WRITE) ? "WRITE" : " ") 1369 << (((sh_flags & SHF_WRITE) && (sh_flags & SHF_ALLOC)) ? '+' : ' ') 1370 << ((sh_flags & SHF_ALLOC) ? "ALLOC" : " ") 1371 << (((sh_flags & SHF_ALLOC) && (sh_flags & SHF_EXECINSTR)) ? '+' : ' ') 1372 << ((sh_flags & SHF_EXECINSTR) ? "EXECINSTR" : " "); 1373 } 1374 1375 //---------------------------------------------------------------------- 1376 // DumpELFSectionHeaders 1377 // 1378 // Dump all of the ELF section header to the specified output stream 1379 //---------------------------------------------------------------------- 1380 void 1381 ObjectFileELF::DumpELFSectionHeaders(Stream *s) 1382 { 1383 if (!(ParseSectionHeaders() && GetSectionHeaderStringTable())) 1384 return; 1385 1386 s->PutCString("Section Headers\n"); 1387 s->PutCString("IDX name type flags " 1388 "addr offset size link info addralgn " 1389 "entsize Name\n"); 1390 s->PutCString("==== -------- ------------ -------------------------------- " 1391 "-------- -------- -------- -------- -------- -------- " 1392 "-------- ====================\n"); 1393 1394 uint32_t idx = 0; 1395 for (SectionHeaderCollConstIter I = m_section_headers.begin(); 1396 I != m_section_headers.end(); ++I, ++idx) 1397 { 1398 s->Printf("[%2u] ", idx); 1399 ObjectFileELF::DumpELFSectionHeader(s, *I); 1400 const char* section_name = m_shstr_data.PeekCStr(I->sh_name); 1401 if (section_name) 1402 *s << ' ' << section_name << "\n"; 1403 } 1404 } 1405 1406 void 1407 ObjectFileELF::DumpDependentModules(lldb_private::Stream *s) 1408 { 1409 size_t num_modules = ParseDependentModules(); 1410 1411 if (num_modules > 0) 1412 { 1413 s->PutCString("Dependent Modules:\n"); 1414 for (unsigned i = 0; i < num_modules; ++i) 1415 { 1416 const FileSpec &spec = m_filespec_ap->GetFileSpecAtIndex(i); 1417 s->Printf(" %s\n", spec.GetFilename().GetCString()); 1418 } 1419 } 1420 } 1421 1422 bool 1423 ObjectFileELF::GetArchitecture (ArchSpec &arch) 1424 { 1425 if (!ParseHeader()) 1426 return false; 1427 1428 arch.SetArchitecture (eArchTypeELF, m_header.e_machine, LLDB_INVALID_CPUTYPE); 1429 arch.GetTriple().setOSName (Host::GetOSString().GetCString()); 1430 arch.GetTriple().setVendorName(Host::GetVendorString().GetCString()); 1431 return true; 1432 } 1433 1434 ObjectFile::Type 1435 ObjectFileELF::CalculateType() 1436 { 1437 switch (m_header.e_type) 1438 { 1439 case llvm::ELF::ET_NONE: 1440 // 0 - No file type 1441 return eTypeUnknown; 1442 1443 case llvm::ELF::ET_REL: 1444 // 1 - Relocatable file 1445 return eTypeObjectFile; 1446 1447 case llvm::ELF::ET_EXEC: 1448 // 2 - Executable file 1449 return eTypeExecutable; 1450 1451 case llvm::ELF::ET_DYN: 1452 // 3 - Shared object file 1453 return eTypeSharedLibrary; 1454 1455 case ET_CORE: 1456 // 4 - Core file 1457 return eTypeCoreFile; 1458 1459 default: 1460 break; 1461 } 1462 return eTypeUnknown; 1463 } 1464 1465 ObjectFile::Strata 1466 ObjectFileELF::CalculateStrata() 1467 { 1468 switch (m_header.e_type) 1469 { 1470 case llvm::ELF::ET_NONE: 1471 // 0 - No file type 1472 return eStrataUnknown; 1473 1474 case llvm::ELF::ET_REL: 1475 // 1 - Relocatable file 1476 return eStrataUnknown; 1477 1478 case llvm::ELF::ET_EXEC: 1479 // 2 - Executable file 1480 // TODO: is there any way to detect that an executable is a kernel 1481 // related executable by inspecting the program headers, section 1482 // headers, symbols, or any other flag bits??? 1483 return eStrataUser; 1484 1485 case llvm::ELF::ET_DYN: 1486 // 3 - Shared object file 1487 // TODO: is there any way to detect that an shared library is a kernel 1488 // related executable by inspecting the program headers, section 1489 // headers, symbols, or any other flag bits??? 1490 return eStrataUnknown; 1491 1492 case ET_CORE: 1493 // 4 - Core file 1494 // TODO: is there any way to detect that an core file is a kernel 1495 // related executable by inspecting the program headers, section 1496 // headers, symbols, or any other flag bits??? 1497 return eStrataUnknown; 1498 1499 default: 1500 break; 1501 } 1502 return eStrataUnknown; 1503 } 1504 1505